Which preposition to use with celebrators

of Occurrences 7%

At that time the inhabitants of Rome resumed the garb of peace, which they had taken off without any decree, under compulsion from the people; they gave themselves up to merrymaking, conveyed Caesar in his triumphal robe into the city and honored him with a laurel crown, so that he enjoyed this decoration as often as the celebrators of triumphs were accustomed to use it.

Which preposition to use with  celebrators